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portentous
01
extraordinary and serving as a warning or sign of future events, often suggesting something bad or threatening
02
puffed up with vanity
Example
The portentous symbols in the ancient text were believed to foretell a major upheaval in the kingdom.
Her portentous remarks about the future made everyone in the meeting feel uneasy and apprehensive.
The portentous news of the company's impending bankruptcy cast a shadow over the entire industry.
The dark clouds gathering on the horizon looked portentous, hinting at a severe storm approaching.
The sudden silence in the room was portentous, suggesting that something important was about to be revealed.